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Explain why the individual who is a carrier for hbv is considered a threat to public health.
Answer:
HBV (hepatitis B) is a viral infection that attacks the liver. It can cause acute or chronic disease and it is transmitted through contact of blood or other body fluids of an infected person.
An infected person can be transmitted through birth, sharing of needles, sharing of common household personal hygiene items, direct contact with an open or bloody sore, or through sexual contact.
It is a hidden treat because those who have hepatitis B can transmit it to another (blood/other body fluid); if they know they have it or not.
Acute hepatitis B is short-term (6 months after being exposed) and they can become immune and can not get infected again; but it can lead to chronic hepatitis B (depends on how healthy the person is).
Chronic hepatitis B can cause liver damage, cirrhosis, liver cancer, and death.
Explanation:
The usefulness of microvilli to cells that have them is ___________________.
A.
to aid in their locomotion
B.
to help concentrate food particles
C.
for intracellular trafficking of molecules
D.
to increase their surface area
E.
None of the above
Answer:
D. to increase their surface area
Explanation:
The usefulness of microvilli to cells that have them is TO INCREASE THEIR SURFACE AREA.
Final answer:
Microvilli are essential for increasing the surface area of absorptive cells in the small intestine, enhancing nutrient absorption.
Explanation:
Micovilli are small projections found on absorptive cells that increase surface area and aid in the absorption of nutrients. For example, absorptive cells in the small intestine utilize microvilli to enhance their capability to absorb food efficiently.
The usefulness of microvilli to cells that have them is to increase their surface area. This increase in surface area is particularly important in the absorptive cells that line the small intestine, where it aids in the efficient absorption of food nutrients. Microvilli contribute to the digestion process by enlarging the surface over which nutrients can be absorbed, thus playing a critical role in ensuring that the body receives the necessary nutrients from the food we consume.
all organisms in the plant kingdom are what three things
Answer:
Multicellular organisms
--Have cell Walls
--Eukaryotic cells.
Contain photosynthetic pigments (which are present in plastids.)
--They are autotrophic mode of nutrition.
Plants are non-motile, live anchored to a substrate.
Reproduction is primarily sexual.
Explanation:
Autotroph: An organism capable of synthesizing its own food from inorganic substances using light or chemical energy
I put dashes next to the ones that I would think are the most important
which of the following is a cause of urbanization?
A-suburban homes became larger than urban homes.
B-paving over land changed the environment.
C-living in cities became more expensive than living in rural areas.
D-agricultural production became more efficient.
The following is a cause of urbanization - D-agricultural production became more efficient.
UrbanizationThe process of shifting populations from rural to urban areas, thereby leading to a higher proportion of people that live in the city.
The principal causes of urbanization include:
Industrialization and increased manufacturingreduce employment opportunities in rural areas due to more efficient agricultural systemsEconomic, political, and social factors that lead to the migration of people to industrialized/urbanized areasModernization in the infrastructure of urbanized areas.Learn more about urbanization:
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Final answer:
The correct cause of urbanization is the increased efficiency of agricultural production, which pushes former agricultural workers towards urban areas for better employment opportunities.
Explanation:
The cause of urbanization that is correct among the provided options is D-agricultural production became more efficient. Technological advances have made agriculture more efficient, requiring fewer workers, and this has pushed many former agricultural laborers to seek work in urban areas where industrial jobs are more plentiful. This migration to cities for jobs and better economic opportunities signifies urbanization.
This process often creates a range of urban challenges, including environmental impacts like urban heat islands, traffic congestion, housing shortages, and social issues such as a widening economic gap and changing urban culture. Additionally, changes in lifestyle and technological advances played a significant role in the urbanization process.
Which of the following is NOT a part of the lithosphere?
Rocks, Water, Soil and None of the above
Answer:
D) none of the above
Explanation:
What are the two lengths that all ellipses have (all planets)?
A. Conic and isoconic length
B. X and Y axes
C. Horizontal and vertical length
D. Minor and major axes
Answer:
D
Explanation:
The major axis is usually the longest diameter of the eclipse while the minor axis is the shortest. It is important to note that the axes have to pass through the center of the eclipse. In a circle, the two axes are usually of equal length.
The two lengths every ellipse has are the major and minor axes, with the major axis being the longest diameter and the minor axis being the shortest. The semi-major and semi-minor axes represent half of their respective full axes. The correct option is D.
The two lengths that all ellipses have are referred to as the major and minor axes. The major axis is the longest diameter of the ellipse and spans the full width from one side to the other, going through the center. The minor axis is the shortest diameter of the ellipse, also passing through the center, perpendicular to the major axis. Half of the major axis is known as the semi-major axis, while half of the minor axis is called the semi-minor axis. The semi-major axis is often used to specify the size of the ellipse, such as in the context of planetary orbits. For example, the semi-major axis of Mars' orbit is 228 million kilometers, which represents the average distance from Mars to the Sun.
Which pair of sentences is describing the same velocity? A. A car is parked. A car is moving in circles. B. A bus drives 40 miles per hour north. A truck drives 50 miles per hour north. C. A boy walks east at 6 kilometers per hour. A girl walks west at the same speed as the boy. D. Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.
Answer:
(D) Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.
Explanation:
Answer:
Option D, Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.
Explanation:
Velocity being a vector quantity possesses both magnitude and direction. Thus, among the given pair of sentence, the one that will describe two entities having equal magnitude and similar direction will be considered as having same velocity. Thus, option D is correct.
Here the magnitude of Valerie bike is 8 kilometers per hour and the magnitude of Owen jogs is also 8 kilometers per hour. Also the direction of their movement is same i.e in south direction.
Which of the following describes a phenomenon that occurs when we observe plants that wilt? A. The roots begin to rot, causing them to no longer uptake water. B. The xylem releases all its water. C. The stomata close, cutting off transpiration and gas exchange. D. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere.
Answer:
A
Explanation:
Plant wilt in other terms means shriveled plant. The plant is unable to support itself and its stem and leaves lay weakly on the ground. This is mostly due to loss of turgidity that is a significant aspect in offering plant support. Turgidity is the result of the plant cells being turgid (by osmosis) and are filled with water causing the plant to be erect. If the roots, that absorb water from the soil, malfunction or die, the plant will wilt.
Answer: The xylem releases all its water describes a phenomenon that occurs when we observe plants that wilt.
A chromosomal mutation in which a segment is missing is called a deletion. True or false?
Answer:
True
Explanation:
Choose the molecule that is described by each phrase. energy used during long activities:
Answer:
Lipids.
Explanation:
Lipids are for longterm energy. Commonly confused with carbohydrates but carbs are short term.
Answer:
This energy comes from fats, specifically lipids.
Explanation:
Lipids are fat molecules that, in the organism of living beings, perform a series of biological functions, mainly the long-term storage of energy.
One of its characteristics is that they are easily stored by the body, but they are difficult to consume. This explains why foods rich in lipids are usually the ones that contribute the most to those unwanted fats!
In fact, when ingested in excess, they are stored in adipose tissue. The organism normally only starts to consume these molecules when there is a deprivation of other energy sources.
The terrestrial planets are characterized by having a ____? A.) silicate core B.) iron-rich silicate core C.) iron-rich metallic core D.) none of these
Answer:
D.) none of these
Explanation:
Releasing fungicide onto the roots of a plant would most likely result in which of the following outcomes?
A. The plant will grow faster.
B. The plant will grow slower.
C. The plant will be able to acquire minerals faster.
Releasing fungicide onto the roots of a plant would most likely result in the plant growing slower. Therefore, option B is correct
Explanation:Releasing fungicide onto the roots of a plant would most likely result in option B: The plant will grow slower. Fungicides are designed to kill or inhibit the growth of fungi, including beneficial fungi that help plants with nutrient absorption. When fungicides are applied to the roots, they can disrupt the symbiotic relationship between the plant roots and beneficial fungi, leading to slower growth and decreased nutrient uptake.
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The first heart sound is made by...
A) blood moving to the atria
B) blood moving to the ventricles
C) opening of the valve between the atria and the ventricles
D) closing of the valve between the atria and the ventricles
The first heart sound, known as 'lub', is caused by the closure of the atrioventricular valves to prevent backflow of blood after the atria contracted to push blood into the ventricles. Therefore, the correct option is D.
Explanation:The first heart sound, often referred to as 'lub', is caused by the closing of the valve between the atria and the ventricles. During the first phase of the cardiac cycle, the atria contract and push blood into the ventricles. After this, the valves close to prevent the backflow of blood which causes the first heart sound. This means that option D is the correct answer to your question.
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What name is given to the process in which a strand of dna is used as a template for the manufacture of a strand of pre-mrna?
That is called Transcription
Hope this helps :)
Which organisms hold the largest amount of energy in most ecosystems?
A. Secondary consumers.
B. Producers. (I think is the correct answer.)
C. Decomposers.
D. Tertiary consumers.
Answer: B. Producers
Explanation:
A food chain is basically a sequence of transfer of food and energy when one organism is consumed by other organism in an ecosystem. In an energy pyramid linked with food chain the producers are present in the lowermost base level trophic level. These organisms exhibit the highest amount of energy as compared to other trophic levels. As these organisms are capable of producing their own food by process of photosynthesis by obtaining the energy from sunlight or by chemosynthesis. This energy decreases in subsequent trophic levels when producers are consumed by consumers.
Answer:
B. Producers
Explanation:
Its correct i took the test
Which cells quickly respond to produce antibodies on second exposure to the same antigen?
Answer:b-cells produce antibodies or (memory b-cells)
Explanation:B cells are one of the two types of lymphocytes, the other kind being T cells. B-cells have a very specific function: the production of antibodies, which play a major role in immunity. Memory cells remember specific foreign invaders, pathogens, and antigens to fight them off if they come back in the future.
owls eat mice.what do we call the mice?
A.prey
B.predators
C.nutrients
Answer:
A.prey
Explanation:
The owl would be called the predator because it is going after the mice. Therefore, the mice would be called prey. Mice are also nutrients but, nobody uses that word in this situation.
Answer:
Explanation:
LOL! I'm not taking your question lightly. I think the answer you want is Prey. However, from the Owl's point of view, probably you could answer nutrients. Mice are not predators. Mice are in the middle of the Food Chain. Grass or grains are on the bottom and the Owl is on top.
Thank you for the question.
For the vast majority of time during elongation in translation, what will you find at the p site of the ribosome?
What are the pros and cons of Quadrat Sampling?
PRO: Quadrats work well for observing changes to whole populations over time, including distribution patterns, nesting and overall health. Some study techniques do not work with quadrats, however. For example, capture-recapture techniques that allow researchers to study individual animals do not work with quadrats because even slow-moving animals can move out of the study boundaries between sample periods.
CON: Despite the relative ease of designing quadrat studies, it is possible to introduce errors into a project. Quadrats that are too large, too small or spaced inappropriately often result in errors. For example, larger species require larger plots. Randomly spaced quadrats that are too small might miss too many individuals, resulting in under-representative estimates of population size.
Answer:
Pros and Cons of Quad-rats sampling are as follow:
Explanation:
It is a series of squares or Quad-rats, generally, use as a tool for the study of ecology and especially biodiversity, In these series of squares which are equal in size placed in the habitat of interest with the species which they recognized and then record its data.
Pros of Quad-rats:
Random placement is fast.Good for substrate and large species.Cons of Quad-rats:
can cause biased results.Difficult to assess the precision of estimate from one survey.One brief stimulus of a skeletal muscle may result in a single isolated contractile event, which is called a twitch. One twitch can generate max tension in a muscle. Are these statements true or false?
Answer:
These statements are true.
False. A muscle twitch is a response to a single stimulus and consists of a latent period, contraction, and relaxation phase. However, one twitch does not produce maximal tension.
The statements in the question are partially true and partially false. A single brief stimulus of a skeletal muscle can indeed result in a single isolated contractile event known as a muscle twitch. However, it is not true that one twitch can generate maximum tension in a muscle. A muscle twitch has three phases: a latent period, a contraction phase, and a relaxation phase. The tension produced by a single twitch can be measured but is not maximal. In order to achieve maximal tension, more motor units need to be stimulated, a process known as recruitment, which can lead to summation and tetanic contractions when stimuli occur frequently and rapidly.
A twitch occurs in response to a single stimulus and the tension produced can be affected by various factors, including the frequency of motor neuron stimulation. Multiple action potentials and an increased number of stimulated motor units are necessary to produce a sufficient amount of force for muscle contraction that can perform work.
Sickle-cell anemia is an example of codominance. What implications does this have for people with one or two copies of the sickle-cell gene?
A. People with two copies of the mutated gene have sickle-cell anemia. People with one copy of the mutated gene have healthy red blood cells. B. People with two copies of the mutated gene are carriers of the disease. People with one copy of the mutated gene don't have the disease. C. People with two copies of the mutated gene have healthy red blood cells. People with one copy of the mutated gene don't have the disease but are carriers of the disease. D. People with two copies of the mutated gene have sickle-cell anemia. People with one copy of the mutated gene have both healthy and misshapen red blood cells and are carriers of the disease.
Answer:
D. People with two copies of the mutated gene have sickle-cell anemia. People with one copy of the mutated gene have both healthy and misshapen red blood cells and are carriers of the disease.
Explanation:
Sickle cell anemia is a genetic and hereditary disease, prevalent in blacks, but may also manifest in whites. It is characterized by a change in red blood cells, which lose their round and elastic shape, acquire the appearance of a sickle (hence the sickle cell name) and harden, which makes it difficult for blood to pass through small vessels and oxygenate tissues. .
Sickle cell red cells contain a type of hemoglobin, hemoglobin S, which crystallizes in the lack of oxygen, forming thrombi that block blood flow because they lack the malleability of normal red blood cells.
Sickle cell anemia is caused by genetic mutation, responsible for the deformity of red blood cells. To be a carrier of the disease, the altered gene must be transmitted by the father and the mother. If transmitted only by one parent, the child will have the sickle cell trait, which may pass on to his descendants, but not the manifest illness. Accordingly, we can conclude that people with two copies of the mutated gene (ie, feared the defective hand and father gene) have sickle cell anemia, although the disease does not manifest itself. On the other hand, people with a copy of the mutated gene have healthy and deformed red blood cells and are carriers of the disease.
Christie's doctor recommends that she eat 40 grams of protein a day. She's already consumed 50% of her protein recommendation for the day. How many servings of the given snack should Christie have to meet her daily protein recommendation? A. 1 B. 3 C. 4 D. 6
I believe the answer is C. 4
Hope this helps.
The servings of the given snack should Christie have to meet her daily protein recommendation with C.4.
What is protein?Large, intricate molecules known as proteins play a variety of vital functions in the body. They are crucial for the structure, operation, and control of the body's tissues and organs and carry out the majority of their job inside cells.
Numerous thousands of amino acids, which are smaller building blocks of proteins, are linked together in lengthy chains to form proteins. To create a protein, 20 distinct kinds of amino acids can be mixed.
Each protein's specific function and distinctive 3-dimensional structure are determined by the order of the amino acids. Combinations of three DNA building blocks (nucleotides), which are determined by the order of genes, are used to code for amino acids.
Therefore, The servings of the given snack should Christie have to meet her daily protein recommendation with C.4.
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Which organelle plays a role in intracellular digestion?
how is mitosis different in plants and animals?
A. In animals, the cell membrane pinches together.
B. In plants,the DNA is one circular chromosomes.
C. In plants, there are no sister chromatids.
D. In animals, a new cell wall forms.
In animals during mitosis, the cell membrane pinches together.
How is mitosis different in plants and animals?One cell divides into two identical daughter cells during the process of mitosis. In the two cells, the chromosomes are distributed equally. Mitosis increases the number of cells in the body that are employed for growth, repair, and regeneration since the number of chromosomes in the daughter cells is the same as in the parent cell. The process of cytokinesis is used to divide the cells after mitosis.Because of how cytokinesis occurs in plant and animal cells, mitosis differs between the two. While cytokinesis in plants occurs through the construction of a cell wall, it occurs in mammals through the creation of a furrow in the plasma membrane.learn more about mitosis here:
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Which correctly identifies the location of the asteroid belt?
Question 1 options:
A
B
C
Answer:
the correct choice is B
located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets.
Answer: B.
Explanation:
The Main asteroid belt in our Solar System is located between the orbits of Mars and Jupiter, therefore it is letter B the one that alludes to the location that better represents it graphically. Many asteroids shaped irregularly and also what is called minor planets is what this belt is made of.
Conscientiousness is a human trait that internalizes True or False
Answer:
True
Explanation:
Conscientiousness is a human trait that internalizes.
One similarity between cell receptors and antibodies is that both
1. are produced by nerve cells
2. are highly specific in their actions
3. slow the rates of chemical reactions
4. are involved in digestion
Answer:
The correct answer is option 2. are highly specific in their actions
Explanation:
Hello!
Let's solve this!
Receptor cells and antibodies are highly specific in their actions. Acntic bodies bind specifically to a protein. The recipient cells bind to a signaling molecule also specifically.
We conclude that the correct answer is option 2. are highly specific in their actions
The similarity between cell receptors and antibodies is that :
They are highly specific in their actions Cell receptors and antibodiesCell receptors are present in human cells in the form of proteins which receive signals passed onto a cell while antibodies help protect the human body against disease and also fight infections or diseases present in the human body as well.
Therefore both cell receptors and antibodies perform specialized function in the human body and can be said to be highly specific in their actions.
Hence we can conclude that The similarity between cell receptors and antibodies is that :They are highly specific in their actions.
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Which of the following statements is NOT true about the process of sweating?
a. Sweating is more likely to occur on hot days than cool days.
b. Excessive sweating can lead to dehydration.
c. Sweating is likely to occur after strenuous exercise.
d. Evaporation of sweat warms the body.
Answer:
D.evaporation of sweats warm the body.
Explanation:
It doesn't warmed the body, it races the heart beat when a person is being actively moved or doing something with great strength.
Evaporation of sweat warms the body is not true about the process of sweating.
Explanation:
The main function of sweat is to reduce the elevated body temperature which is more than the normal body temperature of human body that is 37.2 degree Celsius. The sweat glands present all over skin and when the temperature rises the sweat is released. As the sweat gets evaporated from skin surface, the skin becomes cool. The content of sweat includes water and some salts.
Excessive sweating can leads to dehydration during the summer. During exercise the temperature of the body increases due to which the sweat is released from the sweat glands.
How do herbicide-resistant plants help farmers?
A.farmers can spray for weeds without killing the crops
B.the plants kill the weeds
C.the soil is enriched for future plantings
Herbicide-resistant plants allow farmers to control weeds without harming crops, improving crop yield with reduced chemical use. Thus, the correct answer is A
Herbicide-resistant plants help farmers by:
Allowing farmers to spray for weeds without killing the crops, as the plants can survive the herbicides.Reducing the number of chemicals needed during a growing season, leading to improved weed management and increased crop yield.Enabling the use of reduced-risk herbicides that break down more quickly in soil and are non-toxic to wildlife and humans.Gneiss goes through metamorphosis at a higher temperature than slate so it has a higher
Answer:
Grade of metamorphism
Explanation:
Gneiss forms at a higher grade of metamophic slate. Slate forms at low metamorphic conditions just about a few temperature and pressure.
From the prolith materials exposed to metamorphic conditions, transformations begins as metamorphic changes begins to take place. First, a sediment is transformed into slate, from slate to phyllite, from phyllite to schist, schist to gneiss, gneiss to migmatite and migmatite goes back to melt. These transformation of sediments is controlled by the nature of the prolith materials and the prevailing metamorphic conditions.
Gneiss has a higher metamorphic grade than slate, characterized by high-temperature and pressure conditions that lead to its unique banded texture, known as gneissic banding, and sometimes partial melting which can result in migmatite.
Gneiss undergoes metamorphism at a higher temperature than slate, so it has a higher metamorphic grade. This transformation indicates that the rock has been subject to more intense conditions, potentially including higher pressure in addition to temperature. As a result of this high-grade metamorphism, gneiss is characterized by its coarse, banded texture, known as gneissic banding, where silicate minerals separate into dark and light bands. Similar to the process that forms schist, the conditions for forming gneiss are so extreme that some partial melting may occur, with migmatite representing a transitional phase between metamorphic and igneous rocks.
The progression from slate to phyllite to schist and ultimately to gneiss represents an increasing degree of metamorphism, with visible changes in mineral composition and rock texture. Gneiss typically forms from the metamorphism of schists or granites and most gneisses form at higher temperatures than those that support the stability of minerals like micas found in slate or phyllite.